Sex helps yeast populations adapt better by allowing beneficial mutations to be separated from harmful ones. In a study, yeast populations were evolved in different environments with varying mutation rates. Sex was found to be advantageous in stressful environments where both beneficial and harmful mutations were present. Asexual populations with high mutation rates struggled to adapt, while sexual populations adapted well. This shows that sex not only helps combine beneficial mutations faster but also separates harmful mutations, making adaptation more effective.